题目内容
计算(1)7
+3
-5
;
(2)(2
+3
)2-(2
-3
)2.
| 2 |
| 8 |
| 50 |
(2)(2
| 3 |
| 2 |
| 3 |
| 2 |
(1)7
+3
-5
=7
+6
-25
=-12
;
(2)(2
+3
)2-(2
-3
)2=12+12
+18-(12-12
+18)=24
.
| 2 |
| 8 |
| 50 |
| 2 |
| 2 |
| 2 |
| 2 |
(2)(2
| 3 |
| 2 |
| 3 |
| 2 |
| 6 |
| 6 |
| 6 |
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